Free online time converter

Time is expressed in different units by context — milliseconds in computing, hours in daily life, years in planning. This converter shows every equivalent at once.

Result

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All units

How to use

Enter the time value you want to convert.
Select the unit you are converting from.
Select the unit you want the result in.
The converted value appears instantly, and the table below shows equivalents in all supported units.

Conversion reference

From	To	Multiply by
Hours	Minutes	60
Hours	Seconds	3,600
Days	Hours	24
Days	Seconds	86,400
Weeks	Days	7
Years	Days	365.2425
Years	Seconds	31,556,952
Milliseconds	Seconds	0.001

The month and year values use average Gregorian calendar lengths (365.2425 days/year, 30.436875 days/month). For precise calendar arithmetic, use the date difference calculator.

Common durations

Event	Duration
Human heartbeat	~1 second
9-to-5 workday	8 hours = 480 minutes
Standard work week	40 hours = 2,400 minutes
Month (average)	~730 hours
Year (average)	8,766 hours = 525,960 minutes

Worked examples

90 minutes to hours, minutes, seconds

90 minutes = 1.5 hours = 1 hour 30 minutes = 5,400 seconds
As a decimal duration: 1.500 h

A two-week vacation in different units

14 days = 336 hours = 20,160 minutes = 1,209,600 seconds
As a share of a year: 14 / 365.2425 = 3.83%

A typical human lifespan — 80 years

80 × 365.2425 = 29,219.4 days
80 × 8,766 = 701,280 hours
80 × 31,556,952 = 2.52 billion seconds

Notes

Months are averages — month conversions use 365.2425 ÷ 12 = 30.436875 days. Real months are 28–31 days long. If you need exact month counts between specific dates, use the date-difference calculator, not this one.
Year assumption — 365.2425 days averages across the Gregorian leap-year cycle. A non-leap year has 365 days (31,536,000 s); a leap year has 366 (31,622,400 s).
Milliseconds and microseconds — in computing, 1 s = 1,000 ms = 1,000,000 μs. Human reaction time is about 200 ms; a single video frame at 60 fps is 16.7 ms.
Results are rounded to 6 decimal places.

Frequently asked

How many seconds are in a day?

86,400 seconds. A day is 24 hours × 60 minutes × 60 seconds = 86,400 seconds.

How many seconds are in a year?

About 31,556,952 seconds, using the average Gregorian year of 365.2425 days. A non-leap year has 31,536,000 seconds; a leap year has 31,622,400.

How many minutes are in a week?

10,080 minutes. A week is 7 days × 24 hours × 60 minutes = 10,080 minutes.

How long is a month in seconds?

About 2,629,746 seconds, based on the average Gregorian month (365.2425 days ÷ 12). Individual months range from 28 to 31 days.

How many milliseconds are in a second?

1,000 milliseconds exactly. Milliseconds are common in computing, networking, and precise timing applications.

How do you convert hours to minutes?

Multiply by 60. Example: 2.5 hours × 60 = 150 minutes. To reverse, divide minutes by 60.

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